Draws a 32bit bitmap onto another 32bit bitmap using alpha channel
blending. 'src' will be clipped when drawn onto 'dst'. This procedure is
highly optimized for speed.
src : The source bitmap
dst : The destination bitmap
dst_x : The X coordinate on 'dst' to draw 'src'
dst_y : The Y coordinate on 'dst' to draw 'src'
Draws a 32bit bitmap onto another 32bit bitmap using alpha channel
blending and with a specified opacity, 'globalAlpha'. The value of
'globalAlpha' should be within 0..255, where 0 is completely transparent
and 255 is completely opaque. 'src' will be clipped when drawn onto
'dst'. This procedure is highly optimized for speed.
src : The source bitmap
dst : The destination bitmap
dst_x : The X coordinate on 'dst' to draw 'src'
dst_y : The Y coordinate on 'dst' to draw 'src'
globalAlpha : The global color to use blending 'src' to 'dst'